It is: 7k
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The algebraic expression is 6x+k
It is suppose to be k/3 minus 7
15-k
k-2.5 An algebraic expression is just using variables (in this case, k) for unknown numbers. Since the question is asking what the number k minus 2.5 is, your answer is k-2.5.
the + of a number and 10 k decreased by 4 = k-4